<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>班级学生联动</title>
</head>
<body>
  <div>
    班级：
    <select  id="bj"></select>
    学生：
    <select  id="xs"></select>
  </div>
  
  <button id="Ok">确定</button>
  <span id="Info"></span>

  
  <script src="./js/banji.js" type="module"></script>
</body>
</html>